Tool and device for removal of material on surfaces

ABSTRACT

The invention proposes a tool and device, with the aid of which it is possible to remove the surface of walls, ceilings and floors also in the corners of contaminated interiors.

CROSS REFERENCE TO RELATED APPLICATIONS

The present application is the United States National Stage Applicationof International Application No. PCT/EP2017/078077, filed Nov. 2, 2017,which claims priority to German patent application No. 10 2016 120852.3, filed on Nov. 2, 2016, the entire contents of which each of whichare incorporated herein by reference.

BACKGROUND OF THE INVENTION

The present invention relates to a tool and a device for the removal ofcontaminated material from a wall.

When dismantling nuclear facilities, minimizing contaminated waste is atop priority. This also applies to an efficient decontamination offloors and walls of buildings made of concrete, which protect thenuclear facility or parts thereof from external influences.

Within the context of the claimed invention, for reasons of linguisticsimplification, it primarily will be talked about a wall; however, thefloors and ceilings of rooms and other surfaces are always meant aswell. The use of the present invention is not limited todecontamination.

During the operation of nuclear facilities, in some cases for decades, acontamination of the interior boundary surfaces (walls, floor andceiling) of the building protecting the nuclear plant may result. Forthis reason, such buildings must be decontaminated after terminating thenuclear use. The decontamination includes the removal of surfaces of theinner boundary surfaces (walls, floor and ceiling) to a depth ofapproximately 10 mm to 20 mm. Only the material removed in this processcan possibly include radioactive particles and is to be separatelydisposed.

The remainder of the decontaminated building can either be continuouslyused or be demolished in a conventional manner such as any otherbuilding.

From DE 10 2014 210 947 B2 and the subsequently published DE 10 2016 117163 A1 devices and a method for the removal of surfaces are known. Thesedevices are particularly suitable for the removal of large areas.However, these devices cannot be used in corners. A corner refers to thearea in which two walls converge or where the floor intersects with awall or a wall with the ceiling.

From DE 10 2014 210 947 B2 and the subsequently published DE 10 2016 117163 A1 devices and a method for the removal of surfaces are known. Thesedevices are particularly suitable for the removal of large areas.However, these devices cannot be used in corners. A corner refers to thearea in which two walls converge or where the floor intersects with awall or a wall with the ceiling.

From DE 31 21 130 A1 and DE 10 2010 0389 503, a circular saw head havingtwo circular saw blades disposed at a distance to each other is known.In DE 31 21 130 A1, the circular saw blades are installed on a carryingsleeve. In turn, the carrying sleeve is slid onto a saw shaft and isfastened with the aid of a central nut. DE 10 2010 0389 503 onlyincludes very few constructive details.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a tool and a device,with the aid of which it is possible to efficiently and quickly removethe surface of a wall, the floor or the ceiling even in these corners.

According to the present invention, this object is achieved by a toolfor the removal of surfaces.

In so doing, it is possible to reach all the way into the corners of aroom using the tool according to the present invention, and to thereremove the surface of the wall, the floor or the ceiling. If one usesthe tool according to the present invention on both surfaces forming acorner, the surface in the region of the corners can be completelyremoved. This means that no “leftover” remains, which would have to belaboriously removed manually or otherwise.

In terms of manufacturing technology, the tool according to the presentinvention can be implemented in a relatively easy manner. The driveshaft can be realized as a turned part. On the cylindrical surface ofthis drive shaft, one or a plurality of longitudinal grooves can beintroduced, which are disposed by corresponding projections or lugs onthe inner hole of the saw blades or by spacer rings acting between thesaw blades in such a manner that a rotationally fixed and positiveconnection results. Thereby, the torque required for treating thesurface can be easily and reliably transferred from the drive shaft tothe saw blades. The axial distance between the saw blades can beadjusted by spacer rings.

The tool according to the present invention, includes the drive shaft,at least one longitudinal groove and a collar. Spacer rings are disposedbetween the saw blades, and the spacer rings and/or the saw blades havethrough holes. As a result, these components, with the aid of clampingbolts and in relation to a collar of the drive shaft, are fixed andbraced to each other. The replacement of worn saw blades is very simpleand, with the exception of the last saw blade, commercially common sawblades can be used.

The torque transmission is carried out via one or a plurality of lugs,which are configured at a central opening of the spacer rings and areformed in a complementary manner to the longitudinal groove or groovesof the drive shaft.

In a further advantageous embodiment, the clamping bolts interact withfastening means, in particular internal threads, at one of the collarsof the drive shaft or at a clamping piece slid onto the drive shaft. Inso doing, the saw blades and the spacer rings are fixed in the axialdirection on the drive shaft and are connected to the drive shaft in arotationally fixed manner.

In an advantageous embodiment of the present invention, it is providedthat the last saw blade is centered and/or rotatably fixedly attached onan end face at the second end of the drive shaft. For example, it ispossible that at the second end of the drive shaft, a ledge is present,which is used for centering the last saw blade. The last saw blade canthen be fastened with the aid of screws, which are screwed into threadedholes on the end face at the second end of the drive shaft.

Alternatively, the saw blades can be braced via a central nut to thedrive shaft.

It is also possible that at least the last saw blade has a crank,meaning that in cross section it has a pot-like contour. It is therebypossible that the last saw blade, such as the other saw blades, is alsoslid onto the drive shaft. Owing to the crank, the teeth of the last sawblade still project in the axial direction beyond the second end of thedrive shaft. This embodiment is very easily realized in terms ofmanufacturing technology.

Of course, the other saw blades of the tool according to the presentinvention can also have a crank.

The saw teeth can be made from all suitable cutting materials. Inparticular, the saw teeth can be made of hard metal (coated oruncoated). Alternatively, diamond can be used as a cutting material.

The object mentioned at the outset is likewise achieved by a device forremoving surfaces including a base frame, a linear guide and a slidingcarriage, the sliding carriage being connected via the linear guide tothe base frame, and, according to one of the preceding claims, a toolfor removing material is disposed at the sliding carriage.

With the aid of this device, it is possible to first bring the actuatedtool into a working position, so that the tool immerses into the surfaceto be machined. Subsequently, the sliding carriage, at which therotating tool is located, is moved parallel to the surface to beremoved. This results in a strip-like removal of the surface in the areaof the corner to be machined.

The device according to the present invention is relatively simplyconstructed and is very robust. The device makes it possible to removelonger sections, depending on the length of the linear guide having, forexample, a length of 50 cm to 1.5 m, in one piece and, thereby, toquickly and efficiently remove the surface in the corners ofcontaminated rooms.

It has proven to be advantageous if a bearing unit and/or a drive forthe tool are provided at the sliding carriage. This results in a verycompact and robust construction of the device according to the presentinvention.

In order to be able to carry out the feed movement of the tool along thelinear guide in an automated manner, a linear drive for moving thesliding carriage in relation to the base frame is provided. All drivesknown from the field of construction machinery or machine tools can beconsidered as linear drives. In particular, hydraulic drives, pneumaticdrives, electromechanical drives, such as a threaded spindle and anelectric motor, can be used.

So that the tool according to the present invention can work into thecorners, it is provided that the tool by its second end projectslaterally beyond a longitudinal side of the base frame. The linear guideis situated parallel to the longitudinal side of the base frame. In sodoing, it is possible to move the tool parallel to a longitudinal sideof the base frame and, thereby to remove the surface in the corner of aroom.

In a further advantageous embodiment of the present invention, it isprovided that the saw blades of the tool at least in an end position ofthe sliding carriage project beyond an end face of the base frame.

In order to be able to easily handle the base frame and, thus, theentire device, a mechanical interface is provided on the base frame.This mechanical interface makes it possible to attach the deviceaccording to the present invention, for example, to the arm of anexcavator or another construction machine or the arm of a robot. Withthe aid of the excavator or robot arm, the device according to thepresent invention is moved to the site of operation and is kept in thislocation also during the machining of a surface.

If the device according to the present invention is used successively atboth areas forming a corner, it is possible to completely remove thesurface in the corner. The same applies to corners of a room where threeareas (for example, two walls and the ceiling) intersect. This is notpossible using devices known from the prior art.

In a further advantageous embodiment of the present invention, it isprovided that the base frame has a plurality of spacers. These spacersserve to easily move the tool to a suitable distance from the surface tobe machined. The spacers to some extent act like feet, by which thedevice is placed on the surface to be machined.

An advantageous embodiment of the spacer provides that the spacers havea spring-loaded pin or the like, and that a spring deflection of thepins is greater than the depth of immersion of the tool into the surfaceto be machined.

Furthermore, an (adjustable) length of the spacers is advantageouslydimensioned in such a manner that, if the pins in the decompressed staterest on the surface to be removed, the saw blades of the tool do notimmerse into the surface to be removed. In so doing, the tool ispositioned in the place to be machined in the corner of a room. If thedevice, when the tool is rotating, is now pressed with the aid of anexcavator arm or a robot arm against the spring force of the pins closerto the surface to be machined, the tool or the saw blades of the toolimmerse into the surface to be machined until the spacers rest “firmly”on the surface to be machined. Then the saw blades of the tool have thedesired depth of immersion, for example, of 10 mm, and the feed movementstarts in that the linear drive of the device according to the presentinvention is actuated.

This very simple arrangement enables to position the device at thesurface to be machined and to immerse the saw blades of the tool intothe surface in a simple and uncomplicated manner.

Further advantages and advantageous embodiments of the present inventioncan be gathered from the subsequent drawing, its description and thepatent claims.

BRIEF DESCRIPTION OF THE DRAWINGS

In the drawing,

FIGS. 1A-1C show an exemplary embodiment of a drive shaft of a toolaccording to the present invention;

FIGS. 2A-2B show an embodiment of a saw blade;

FIGS. 3A-3B show an embodiment of a spacer ring;

FIGS. 4A-4C show a second embodiment of a saw blade, with FIG. 4B beinga cross-section taken along line A-A of FIG. 4A;

FIG. 5 shows the tool according to the present invention in theassembled state including saw blades and spacer rings;

FIG. 6 shows an isometry of a device according to the present invention;

FIG. 7 shows a bottom view onto the device according to the presentinvention;

FIG. 8 shows a side view from the right of the device according to thepresent invention;

FIG. 9 shows a front view of the device according to the presentinvention;

FIG. 10 shows a rear view onto the device according to the presentinvention;

FIG. 11 shows a top view onto the device according to the presentinvention;

FIG. 12 shows a side view from the left of the device according to thepresent invention.

FIG. 13 shows an embodiment of a clamping piece.

DETAILED DESCRIPTION

FIGS. 1A-1 C show schematically an exemplary embodiment of a drive shaft1 according to the present invention in a side view and in a front view.

Drive shaft 1 has a first end 3. There, drive shaft 1 is rotatablymounted (not shown). The mounting can, for example, be carried out via abearing pin 5, which is connected via a bearing block (not shown) to asliding carriage of the device according to the present invention. Thereare various design options to carry out this mounting. Usually, rollingbearings are disposed between drive shaft 1 and the bearing block.

In the region of first end 3 of drive shaft 1, a stub shaft 6 ismoreover provided, via which drive shaft 1 is actuated. This actuationmay, for example, be via a flexible shaft (not shown), an electricmotor, a hydraulic motor or any other rotary drive known from the priorart.

A plurality of saw blades (not shown in the FIG. 1 ) can be slid ontodrive shaft 1, which may have a cylindrical outer contour. The sawblades have to be centered and it is necessary to establish arotationally fixed connection between the saw blades (not shown) anddrive shaft 1. A very simple and reliable exemplary embodiment of such arotationally fixed connection can be realized in that one or twolongitudinal grooves 7 are introduced into the drive shaft. Longitudinalgrooves 7 start from a second end 9 of drive shaft 1 and extend notquite all the way to first end 3 of drive shaft 1. Longitudinal grooves7 are clearly visible in the front view in the left part of FIG. 1C. Theouter diameter of drive shaft 1 is denoted with reference character 13.

An optional square 11 and a collar 17 are disposed between bearing pin 5and (cylindrical) section 13. Not shown in the FIG. 1 is a clampingpiece which is slid over stub shaft 6, bearing pin 5 and square 11against collar 17. In the clamping piece, threaded holes are present,the hole pattern of which matches the hole patterns of saw blades 19, 25and spacer rings 33. Details of the clamping piece are disclosed in FIG.13 and its description.

In FIGS. 2A-2B, one of a plurality of grinding disks or saw blades 19,which are slid onto drive shaft 1, is illustrated in an exemplarymanner. The grinding disk or saw blade 19 is shown only schematically.

Saw blade 19 or the grinding disks has/have a central opening 21, theshape and dimensions of which are matched to outer diameter 13 of driveshaft 1 in such a way that a plurality of saw blades 19 can be slid ontodrive shaft 1.

With the exception of last saw blade 25, saw blade 19 or the grindingdisks are commercially available on the market.

FIGS. 3A-3B show a spacer ring 33. As saw blades 19, the spacer ring hasa central opening 21, the form and dimensions of which are matched toouter diameter 13 of drive shaft 1. At opening 21 of spacer ring 33,lugs 23 are configured, which positively interact with grooves 7 ofdrive shaft 1.

Saw blades 19, 25 and the spacer rings 33 have a plurality of throughholes 29, so that clamping screws cannot be inserted through throughholes 29 of saw blades 25 and of spacer rings 33.

FIGS. 4A-4C show a further exemplary embodiment of last saw blade 25according to the present invention. The outer diameter of last saw blade25 is usually of equal size as the outer diameter of other saw blades19.

In this exemplary embodiment, last saw blade 25 has a ledge 27 at thecenter. Central opening 21 and through holes 29 are located within ledge27. By sliding last saw blade 25 onto diameter 13 of drive shaft 1, lastsaw blade 25 is centered. The at least one optional lug 23 of saw blade25 corresponds to lugs 23 of spacer rings 33. The lugs engage into theat least one longitudinal groove 7 of drive shaft 1 and, for thisreason, establish a rotationally fixed connection between saw blade 25and drive shaft 1.

Through holes 29 of last saw blade 25 are provided with sinkings 28,which accommodate a screw head of the clamping screws, not shown. As aresult, the screw heads do not project in the axial direction beyondlast saw blade 25.

This configuration of last saw blade 25 and drive shaft 1 makes itpossible to brace, with the aid of last saw blade 25 and screws insertedthrough through holes 29 and screwed into the threaded holes of clampingpiece 30, all saw blades 19, 25 and spacer rings 33 to one another andto drive shaft 1. This situation is shown schematically in FIG. 5 . Thesimplified screws illustrated as dash-dotted lines are denoted withreference character 31. The heads of the screws are accommodated insinking 28 of last saw blade 25 so that they in the axial direction donot project beyond the teeth of last saw blade 25.

If screws 31 are tightened, all saw blades 19 and 25 are braced againsteach other in the axial direction. The torque is transmitted vialongitudinal groove 7 and lugs 23 and by a non-positive connectionbetween saw blades 19, 25 and spacer rings 33. For this reason, arotationally fixed connection between saw blades 19 and 25 on the onehand and drive shaft 1 on the other hand is ensured.

As can be seen from FIG. 5 , spacer rings 33 may be disposed between sawblades 19 and 25. These spacer rings 33 serve to adjust in the axialdirection the desired distance between saw blades 19 among one anotheror between last saw blade 25 and adjacent saw blade 19. By using spacerrings 33 of different thickness, the number of saw blades 25 and therebythe required contact force can be adjusted for the removal of thesurface. When axially spaced saw blades 25 immerse into the surface tobe removed, webs, the width of which corresponds approximately to thethickness of spacer rings 33, remain. In this way, the width of the webscan also be adjusted via the thickness of spacer rings 33. As the widthof the webs increases, the webs become more stable and it becomesincreasingly more difficult to remove them from the substrate. Using thedevice according to the present invention, the webs during machiningshould simultaneously break and fall off the wall.

As a rule, the width of the webs is chosen as large as possible tominimize the contact force and the machining volume. However, it must beensured that the webs do not become too wide. In order to optimallyadjust tool 35 according to the present invention to differentmaterials, a plurality of different spacer rings 33 can be chosen, whichcan be used as needed. In this instance, the optimal distances of sawblades 25 can be determined by tests on the surface to be removed.

It is important to note within the context of the present invention thatthe teeth of last saw blade 25 project in the axial direction furthestbeyond drive shaft 1. This means that the teeth of last saw blade 25 arethose components/elements of the tool according to the presentinvention, which in FIG. 5 project furthest to the right. No part ofdrive shaft 1, saw blade 25 or screws 31 projects further to the rightin FIG. 5 than the saw teeth disposed at the outer diameter of last sawblade 25.

Within the context of the present invention, the term saw teeth isbroadly defined. Usually, the term “saw tooth” is used if the tool has acutting edge which is geometrically defined. Within the context of thepresent invention, saw blades 19, 25 can also be coated with diamondgrains or other abrasively acting cutting materials. Then a removal ofthe surface is carried out using a geometrically undefined cutting edge.Typically, then one would talk of a grinding operation—rather thansawing; however, for configuring the tool according to the presentinvention, this is not relevant.

In FIG. 5 , at the left end of drive shaft 1, a bearing block 71 isshown, which includes a section 73 having a hexagonal outer contour anda threaded section 77. A grooved nut 75 is screwed onto thread section77. With the aid of grooved nut 77, bearing block 71 can be fastened bya suitable receptacle at a device 37 for the removal of surfacesaccording to the present invention.

In FIG. 6 , a device 37 for the removal of contaminated surfacesaccording to the present invention is illustrated isometrically. Thetool according to the present invention, as illustrated in an exemplarymanner in FIGS. 1 through 5 , overall is denoted with referencecharacter 35. Device 37 according to the present invention can bedivided into the following components: a base frame 39, a slidingcarriage 41, a linear guide 43 and a linear drive 45. A port for a dustextraction has been provided with reference numeral 47. The dustextraction encloses tool 35 as much as possible. For this reason, thedust extraction in some views obscures tool 35 in whole or in part.

Tool 35 according to the present invention is rotatably mounted onsliding carriage 41. For this purpose, bearing block 71 is used. Insliding carriage 41, a plurality of hexagonal breakthroughs 79 arepresent, which interact with section 73 of bearing block 71 having ahexagonal outer contour. If grooved nut 75 is wound onto threadedportion 77 of bearing block 71 and is tightened, bearing block 71, andby extension tool 35 according to the present invention, is firmlyconnected to sliding carriage 41. If sliding carriage 41, as shown, hasa plurality of breakthroughs 79, then tool 35 can be installed indifferent places at the sliding carriage.

Optionally, sliding carriage 41 can have a (drive) motor, which directlyor indirectly initiates a rotation of drive shaft 1 of tool 35. In theshown exemplary embodiment, tool 35 is actuated via a flexible shaft(not shown). In both alternatives, the actuator can be an electricmotor, a hydraulic motor, a pneumatic drive, or another drive know fromthe prior art.

In FIG. 6 , it can be clearly seen that a plurality of saw blades 19 anda last saw blade 25 are disposed at a relative short distance from oneanother at drive shaft 1 of tool 35. For reasons of clarity, only lastsaw blade 25, which in FIG. 6 is located at the left end of tool 35, isprovided with reference numerals.

Linear drive 45 can be configured as a hydraulic double-acting cylinder,a double-acting pneumatic cylinder or an electromechanical linear drive.

As a basic principle, all robust drives 45 and linear guides 43 knownfrom the prior art are suitable. The travel of sliding carriage 41 or oftool 35 can be adjusted via adjustable stops.

In base frame 39, three spacers 49 are disposed, which at its end facingaway from base frame 49 may have a spring-loaded (spring) element 51.Spring-loaded spring element 51 can be a metal pin, which is guided inspacer 49 and which can be pressed against the force of a pressurespring disposed in spacer 49 (not visible) into the interior of spacer49. Spacers 49 can also be configured without a spring element.

A stop of spacer 49 is denoted with reference character 54. Stop 54defines the depth of immersion of tool 35 into the surface to beremoved.

Preferably, spacers 49 are screwed to base frame 39 or inserted intobase frame 39. For this reason, it is possible to easily adjust theheight of spacers 49 in that nuts 53, by which spacers 49 are attachedto base frame 39, are twisted. The isometry of FIG. 6 shows only littleof nut 53 which is respectively in the back in FIG. 6 .

FIG. 7 shows a bottom view onto device 37 according to the presentinvention. This view allows to clearly recognize important geometricalrelations.

In particular, it results that spacers 49 by their stops 54 projectbeyond the outer diameter of saw blades 19 and of last saw blade 25. InFIG. 7 , this is illustrated by a line which connects stops 54. Thus, ifdevice 37 by stops 51 is placed on a surface to be removed representedby the mentioned connecting line, then saw blades 19, 25 immerse intothe surface.

If the device is pressed against the force of spring element 51 furtherin the direction of the surface, then saw blades 19, 25 immerse intosurface 55 to be removed, because stops 54 are positioned so that sawblades 19 and 25 project beyond them.

In other words: if device 37 according to the present invention isgently placed onto a surface 55 to be machined using spring elements 51,saw blades 19 and 25 can still rotate freely; they are not yet inengagement with surface 55 to be machined.

If now the device according to the invention is pressed against springelements 51 onto surface 55 to be machined until the stops of spacers 49rest on surface 55, saw blades 19 and 25 immerse into surface 55 to bemachined.

This two-stage use in the first step enables the positioning of thedevice according to the present invention in the desired location. Thentool 35 is rotated and, in a further step, device 37 is placed by hardends 54 of spacer 49 onto surface 55 to be machined. Adjusting thelength of spacers 49 by re-adjusting nuts 53 can be affected veryeasily. In so doing, the immersion depth of saw blades 19 and 25 isadjusted.

In FIG. 7 , a drive 85 having a first pinion and a second pinion 87spaced apart therefrom can be seen. A chain connecting the first and thesecond pinion 87 is not shown. Second pinion 87 actuates a threadedspindle, which in this embodiment forms linear drive 45 for carriage 43.In FIG. 6 , drive 85 and second pinion 87 are covered by a cover.

FIG. 8 shows a side view of device 37 according to the presentinvention. In this figure, drive 85 can be clearly seen. It becomesevident from this side view that spacers 49 having optional springelements 51 and stops 54 facilitate the positioning and immersion of sawblades 19 and 25 into surface 55 to be machined.

In FIG. 8 , sliding carriage 41, and so does tool 35, approximately inthe middle of the movement path. In FIG. 8 , a first end position is atthe lower end of base frame 39. If tool 35 is located in the oppositeend position (at the upper end of base frame 39 in FIG. 8 ), saw blades19, 25 project beyond base frame 39. The contour of saw blades 19, 25 isindicated by a dashed line.

It is intended to make clear that tool 35 can be moved with the aid ofdevice 37 according to the present invention into the corner between twosurfaces 55 situated adjacent to each other.

At the (back) side of base frame 39 opposite of tool 35, a mechanicalinterface 57 is provided. With the help of this mechanical interface(57), it is possible to attach device 37 according to the presentinvention, for example, to an excavator arm or a robot arm and then tomove device 37 with the help of this excavator arm or robot arm to thedesired location and to keep it in that place during the machining ofsurfaces 55. Using an excavator or robotic arm, their functions can beused for the removal of surface 55, and device 37 according to thepresent invention can be kept structurally simple. Particularlypreferably, interface 57 is designed so that device 37 can be rotatably(and lockably) attached by 360° to interface 57. Then, the working orfeed direction of device 37 can be adjusted in the simplest manner.

FIG. 9 shows a device 37 according to the present invention in a frontview. In this view, drive shaft 11 of the tool, having various sawblades 19 and 25, can clearly be seen. This view also makes it evidentthat there are three spacers 49. In the upper left-hand corner of thedevice in FIG. 9 , no spacer is provided so that tool 35 can be movedbeyond an end face 59 of base frame 39. Spacers 49 can be inserted intobase frame 39 or can be attached, for example using nuts 53, to baseframe 39 so that they can always be installed or [removed] as needed.

In this figure, it also becomes evident that tool 35 in the axialdirection projects beyond a longitudinal side 61 of base frame 39. Inthis way, it is possible to remove the surface all the way into thecorners of a room.

FIG. 10 shows the device according to the present invention in a rearview not having a mechanical interface. Only four fastening holes 81 andone central breakthrough 83 can be seen. Supply lines are guided throughbreakthrough 83. A mechanical interface is screwed to fastening holes81.

For example, all mechanical interfaces known from the field ofconstruction machinery can be used as mechanical interface. It isparticularly preferable if such an interface enables device 37 to rotateby up to 360°.

The device according to the present invention is often fastened to thearm of an excavator. For this purpose, one uses the mechanicalinterfaces established for excavators.

In FIG. 10 , a working area of the tool (35) is indicated by adash-dotted line 65. The feed direction of sliding carriage 41 inrelation to base frame 39 is indicated by a double arrow 67.

In FIG. 11 , which shows a top view of device 37 according to thepresent invention, such a mechanical interface 57 is illustrated.

FIG. 12 shows a side view from the left.

In FIG. 13 , a clamping piece 30 is shown. The clamping piece has acentral breakthrough 89, which is matched in terms of shape anddimensions in the illustrated embodiment to optional square 11 of driveshaft 1. Here, breakthrough 89 is formed as a square breakthrough.

A recess 91, which is matched in terms of shape and dimensions in theillustrated embodiment to collar 17 of drive shaft 1, is formedconcentrically to breakthrough 89. This means that the clamping piece inFIG. 5 is slid onto drive shaft 1 from the left and that collar 17 formsan axial stop for clamping piece 30.

In clamping piece 30, internal threads 93 are configured, the positionof which corresponds to the position of through hole 29 of saw blades 25and spacer rings 33. In order to connect saw blades 19 and 25 in arotationally fixed and axially fixed manner to drive shaft 1, clampingscrews 31 indicated in FIG. 5 are inserted through saw blade 25 and sawblades 19 and through spacer rings 33 and are screwed into internalthreads 93 of clamping piece 30.

In an alternative embodiment (not illustrated), clamping piece 30 anddrive shaft 1 are configured as a single piece. This means that collar17 has a greater diameter than illustrated in FIG. 1 and takes over thefunction of the clamping piece. Internal threads 93 are then locatedwithin collar 17.

What is claimed is:
 1. A device for the removal of surfaces to animmersion depth, comprising a base frame, a linear guide and a slidingcarriage, wherein the sliding carriage is coupled via the linear guideto the base frame, characterized in that a tool for the removal ofsurfaces comprises a drive shaft, wherein the drive shaft is rotatablymounted at a first end, wherein a plurality of circular saw blades eachhaving saw teeth are disposed at the drive shaft, and wherein the sawteeth of a last saw blade disposed at a second end of the drive shaftopposite of the first end project in the axial direction beyond thesecond end of the drive shaft wherein the saw blades are connected tothe drive shaft in a rotationally fixed manner, wherein the drive shaftcomprises at least one longitudinal groove and a collar, wherein spacerrings are disposed between the saw blades, and wherein the spacer ringsand the saw blades have through holes and a central opening, wherein atleast one lug is configured and positioned at the central openings ofthe spacer rings, and that the at least one lug is formed in acomplementary manner to the at least one longitudinal groove of thedrive shaft, and the base frame has a plurality of spacers eachincluding a stop.
 2. The device as recited in claim 1, characterized inthat a bearing block for the tool is provided at the sliding carriage.3. The device as recited in claim 1, characterized in that a lineardrive for moving the sliding carriage in relation to the base frame isprovided.
 4. The device as recited in one of claim 1, characterized inthat the shaft laterally projects beyond the base frame.
 5. The deviceas recited in claim 1, characterized in that at least a portion of thesaw blades project beyond an end face of the base frame.
 6. The deviceas recited in claim 1, characterized in that the base frame has amechanical interface.
 7. The device as recited in claim 6, characterizedin that the mechanical interface interacts with a mechanical interfaceat a construction machine.
 8. The device as recited in claim 1,characterized in that the spacers respectively have one spring elementand that a spring deflection of the spring elements is greater than theimmersion depth.
 9. The device as recited in claim 8, characterized inthat a length of the spacers is dimensioned in such a manner that, ifthe spring element in the decompressed state rests on the surface to beremoved, the saw blades of the tool do not immerse into the surface tobe removed.